EMIR (Espectrógrafo Multiobjeto Infrarrojo) is a wide-field, near-infrared, multi-object spectrograph, with image capabilities, which will be located at the Nasmyth focus of GTC (Gran Telescopio Canarias). It will allow observers to obtain many intermediate resolution spectra simultaneously, in the nIR bands Z, J, H, K. A multi-slit mask unit will be used for target acquisition. This paper shows an overview of EMIR Data Factory System which main functionality is to receive raw images from DAS (Data Acquisition system), collect FITS header keywords, store images to database and propagate images to other GCS (GTC Control System) components to produce astronomical data. This system follows the standards defined by the telescope to permit the integration of this software on the GCS. The Data Factory System needs the DAS, the Sequencer, GUI and the Monitor Manager subsystems to operate. DAS generates images and sends them to the Data Factory. Sequencer and GUI (Graphical User Interface) provide information about instrument and observing program. The Monitor Manager supplies information about telescope and instrument state.